SchedulerVolumeBinder: don't modify assumed pod in AssumePodVolumes

[cofyc]

What type of PR is this?

Uncomment only one /kind <> line, hit enter to put that in a new line, and remove leading whitespace from that line:

/kind api-change
/kind bug
/kind cleanup
/kind deprecation
/kind design
/kind documentation
/kind failing-test
/kind feature
/kind flake

What this PR does / why we need it:
It seems not necessary right now and we don't use Spec.NodeName in AssumePodVolumes method.

Scheduler.assume will set Spec.NodeName to SuggestedHost later in the same scheduling cycle.

kubernetes/pkg/scheduler/scheduler.go

Lines 583 to 591 in 7ba332a

	// Run "reserve" plugins.
	if sts := prof.RunReservePlugins(schedulingCycleCtx, state, assumedPod, scheduleResult.SuggestedHost); !sts.IsSuccess() {
	sched.recordSchedulingFailure(prof, assumedPodInfo, sts.AsError(), SchedulerError, sts.Message())
	metrics.PodScheduleErrors.Inc()
	return
	}
	// assume modifies `assumedPod` by setting NodeName=scheduleResult.SuggestedHost
	err = sched.assume(assumedPod, scheduleResult.SuggestedHost)

Which issue(s) this PR fixes:

Fixes #

Special notes for your reviewer:

Does this PR introduce a user-facing change?:

NONE

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

[cofyc]

/priority backlog
/sig storage
/sig scheduling
/assign @msau42

[k8s-ci-robot]

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[cofyc]

/test pull-kubernetes-node-e2e

[msau42]

/lgtm
/retest

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